A falling analyte stream configuration for spectroscopic analysis of aqueous solutions

摘要

An optical-fibre based sensor has been coupled with a falling cylindrical stream of liquid, which enhanced the collection of fluorescent light. The configuration is suited to taking measurements from liquids with any refractive index, such as aqueous solutions. The parameters which determine the stream stability have been investigated, and the optical collection efficiency has been mathematically modelled. We have produced streams up to 350mm long with a 2.5 mm diameter, and measured a fluorescent collection enhancement of 9 from a 100mm long, 1mm diameter stream.